300 lines
12 KiB
XML
300 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<!DOCTYPE document [
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<!ENTITY project SYSTEM "project.xml">
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]>
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<document url="fs-admin-apps.html">
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&project;
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<properties>
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<author email="craigmcc@apache.org">Craig McClanahan</author>
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<title>Administrative Apps - Overall Requirements</title>
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</properties>
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<body>
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<section name="Table of Contents">
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<toc/>
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</section>
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<section name="Overview">
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<subsection name="Introduction">
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<p>The purpose of this specification is to define high level requirements
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for administrative applications that can be used to manage the operation
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of a running Tomcat container. A variety of <em>Access Methods</em>
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to the supported administrative functionality shall be supported, to
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meet varying requirements:</p>
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<ul>
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<li><em>As A Scriptable Web Application</em> - The existing
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<code>Manager</code> web application provides a simple HTTP-based
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interface for managing Tomcat through commands that are expressed
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entirely through a request URI. This is useful in environments
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where you wish to script administrative commands with tools that
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can generate HTTP transactions.</li>
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<li><em>As An HTML-Based Web Application</em> - Use an HTML presentation
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to provide a GUI-like user interface for humans to interact with the
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administrative capabilities.</li>
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<li><em>As SOAP-Based Web Services</em> - The operational commands to
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administer Tomcat are made available as web services that utilize
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SOAP message formats.</li>
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<li><em>As Java Management Extensions (JMX) Commands</em> - The operational
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commands to administer Tomcat are made available through JMX APIs,
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for integration into management consoles that utilize them.</li>
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<li><em>Other Remote Access APIs</em> - Other remote access APIs, such
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as JINI, RMI, and CORBA can also be utilized to access administrative
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capabilities.</li>
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</ul>
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<p>Underlying all of the access methods described above, it is assumed
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that the actual operations are performed either directly on the
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corresponding Catalina components (such as calling the
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<code>Deployer.deploy()</code> method to deploy a new web application),
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or through a "business logic" layer that can be shared across all of the
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access methods. This approach minimizes the cost of adding new
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administrative capabilities later -- it is only necessary to add the
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corresponding business logic function, and then write adapters to it for
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all desired access methods.</p>
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<p>The current status of this functional specification is
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<strong>PROPOSED</strong>. It has not yet been discussed and
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agreed to on the TOMCAT-DEV mailing list.</p>
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</subsection>
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<subsection name="External Specifications">
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<p>The implementation of this functionality depends on the following
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external specifications:</p>
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<ul>
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<li><a href="http://docs.oracle.com/javase/7/docs/technotes/guides/idl">
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Java IDL</a> (for CORBA, included in the JDK)</li>
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<li><a href="http://www.oracle.com/technetwork/java/javase/tech/javamanagement-140525.html">
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Java Management Extensions</a></li>
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<li><a href="http://docs.oracle.com/javase/7/docs/technotes/guides/rmi">
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Remote Method Invocation</a> (Included in the JDK)</li>
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</ul>
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</subsection>
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<subsection name="Implementation Requirements">
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<p>The implementation of this functionality shall conform to the
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following requirements:</p>
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<ul>
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<li>To the maximum extent feasible, all administrative functions,
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and the access methods that support them, shall run portably
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on all platforms where Tomcat itself runs.</li>
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<li>In a default Tomcat distribution, all administrative capabilities
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shall be disabled. It shall be necessary for a system
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administrator to specifically enable the desired access methods
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(such as by adding a username/password with a specific role to
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the Tomcat user's database.</li>
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<li>Administrative functions shall be realized as direct calls to
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corresponding Catalina APIs, or through a business logic layer
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that is independent of the access method used to initiate it.</li>
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<li>The common business logic components shall be implemented in
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package <code>org.apache.catalina.admin</code>.</li>
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<li>The common business logic components shall be built as part of the
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standard Catalina build process, and made visible in the
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Catalina class loader.</li>
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<li>The Java components required for each access method shall be
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implemented in subpackages of <code>org.apache.catalina.admin</code>.
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</li>
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<li>The build scripts should treat each access method as optional,
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so that it will be built only if the corresponding required
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APIs are present at build time.</li>
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<li>It shall be possible to save the configured state of the running
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Tomcat container such that this state can be reproduced when the
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container is shut down and restarted.</li>
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<li>Administrative commands to start up and shut down the overall
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Tomcat container are <strong>out of scope</strong> for the
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purposes of these applications. It is assumed that other
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(usually platform-specific) mechanisms will be used for container
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startup and shutdown.</li>
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</ul>
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</subsection>
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</section>
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<section name="Dependencies">
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<subsection name="Environmental Dependencies">
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<p>The following environmental dependencies must be met in order for
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administrative applications to operate correctly:</p>
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<ul>
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<li>For access methods that require creation of server sockets, the
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appropriate ports must be configured and available.</li>
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</ul>
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</subsection>
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<subsection name="Container Dependencies">
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<p>Correct operation of administrative applications depends on the
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following specific features of the surrounding container:</p>
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<ul>
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<li>To the maximum extent feasible, Catalina components that offer
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direct administrative APIs and property setters shall support
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"live" changes to their operation, without requiring a container
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restart.</li>
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</ul>
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</subsection>
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<subsection name="External Technologies">
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<p>The availability of the following technologies can be assumed
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for the implementation and operation of the various access methods
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and the corresponding administrative business logic:<br/>
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<strong>FIXME</strong> - This list below is totally outdated, but nobody
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cares about the administrative app anymore. It is removed and unsupported
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since Tomcat 6.0.</p>
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<ul>
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<li><a href="http://www.oracle.com/technetwork/java/javase/overview/index.html">
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Java Standard Edition</a> (Version 1.2 or later)</li>
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<li><a href="https://www.jcp.org/jsr/detail/154.jsp">Servlet 2.4</a>
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(supported natively by Tomcat 5)</li>
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<li><a href="https://www.jcp.org/jsr/detail/152.jsp">JavaServer Pages 2.0</a>
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(supported natively by Tomcat 5)</li>
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<li><a href="https://jakarta.apache.org/taglibs/doc/standard-doc/intro.html">JavaServer Pages Standard Tag Library 1.0 (Jakarta Taglibs-Standard 1.0.3)</a></li>
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<li><a href="https://struts.apache.org/">Struts Framework</a>
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(Version 1.0) - MVC Framework for Web Applications</li>
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<li><strong>TO BE DETERMINED</strong> - Application for hosting SOAP
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based web services</li>
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</ul>
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</subsection>
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</section>
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<section name="Functionality">
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<subsection name="Properties of Administered Objects">
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<p>Functional requirements for administrative applications are specified
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in terms of <em>Administered Objects</em>, whose definitions and detailed
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properties are listed <a href="fs-admin-objects.html">here</a>. In general,
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Administered Objects correspond to components in the Catalina architecture,
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but these objects are defined separately here for the following reasons:</p>
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<ul>
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<li>It is possible that the administrative applications do not expose
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every possible configurable facet of the underlying components.</li>
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<li>In some cases, an Administered Object (from the perspective of an
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administrative operation) is realized by more than one Catalina
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component, at a finer-grained level of detail.</li>
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<li>It is necessary to represent the configuration information for a
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component separately from the component itself (for instance, in
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order to store that configuration information for later use).</li>
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<li>It is necessary to represent configuration information (such as
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a Default Context) when there is no corresponding component instance.
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</li>
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<li>Administered Objects, when realized as Java classes, will include
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methods for administrative operations that have no correspondence
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to operations performed by the corresponding actual components.</li>
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</ul>
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<p>It is assumed that the reader is familiar with the overall component
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architecture of Catalina. For further information, see the corresponding
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Developer Documentation. To distinguish names that are used as both
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<em>Administered Objects</em> and <code>Components</code>, different
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font presentations are utilized. Default values for many properties
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are listed in [square brackets].</p>
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</subsection>
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<subsection name="Supported Administrative Operations">
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<p>The administrative operations that are available are described in terms
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of the corresponding Administered Objects (as defined above), in a manner
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that is independent of the access method by which these operations are
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requested. In general, such operations are relevant only in the context
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of a particular Administered Object (and will most likely be realized as
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method calls on the corresponding Administered Object classes), so they
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are organized based on the currently "focused" administered object.
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The available Supported Operations are documented
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<a href="fs-admin-opers.html">here</a>.</p>
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</subsection>
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<subsection name="Access Method Specific Requirements">
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<h5>Scriptable Web Application</h5>
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<p>An appropriate subset of the administrative operations described above
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shall be implemented as commands that can be performed by the "Manager"
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web application. <strong>FIXME</strong> - Enumerate them.</p>
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<p>In addition, this web application shall conform to the following
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requirements:</p>
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<ul>
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<li>All request URIs shall be protected by security constraints that
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require a security role to be assigned for processing.</li>
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<li>The default user database shall <strong>not</strong> contain any
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user that has been assigned a security role.</li>
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</ul>
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<h5>HTML-Based Web Application</h5>
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<p>The entire suite of administrative operations described above shall be
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made available through a web application designed for human interaction.
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In addition, this web application shall conform to the following
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requirements:</p>
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<ul>
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<li>Must be implemented using servlet, JSP, and MVC framework technologies
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described under "External Technologies", above.</li>
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<li>Prompts and error messages must be internationalizable to multiple
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languages.</li>
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<li>Rendered HTML must be compatible with Netscape Navigator (version 4.7
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or later) and Internet Explorer (version 5.0 or later).</li>
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</ul>
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</subsection>
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</section>
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<section name="Testable Assertions">
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<p><strong>FIXME</strong> - Complete this section.</p>
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</section>
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</body>
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</document>
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